[Bug gdb/27324] New: [REGRESSION] `exceptions.UnicodeEncodeError` upon loading a config with λ

["hi-angel at yandex dot ru" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27324

            Bug ID: 27324
           Summary: [REGRESSION] `exceptions.UnicodeEncodeError` upon
                    loading a config with λ
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: hi-angel at yandex dot ru
  Target Milestone: ---

I built latest master to check something, and found there's a regression
regarding configuration files. Works correctly on latest released 10.1.

Not sure how to bisect, because there's too many commits, and the gdb python
exception does not print any stacktrace to point out where's the code

# Steps to reproduce (in terms of terminal commands)

     λ cat test-prompt
    set extended-prompt \[\e[31m\]gdb λ \[\e[0m\]
     λ gdb/gdb -q --nh -x test-prompt
    Python Exception <type 'exceptions.UnicodeEncodeError'> 'ascii' codec can't
encode character u'\u03bb' in position 14: ordinal not in range(128):
    (gdb)

## Expected

gdb gets loaded as usual and there's a λ prompt as assigned in config

## Actual

gdb prints an error, and the prompt is left unchanged

# Additional information

gdb built from commit `e0bd9202fb: gdb/testsuite: use proc_with_prefix in
gdb.base/scope.exp`

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